Brass Spring Check Valve an yi shi da jabun tagulla, wanda kuma ake kira bawul ɗin da ba zai dawo ba, an ƙera shi don sarrafa tsarin sarrafa ruwa, ana sarrafa ruwan ta diski kuma yana gudana ta hanya ɗaya, ana amfani da shi sosai don aikin famfo, famfo, da bututun mai.